<!--
  speedy-vision.js
  GPU-accelerated Computer Vision for JavaScript
  Copyright 2020-2024 Alexandre Martins <alemartf(at)gmail.com>

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

  image-portal.html
  Image Portals
-->
<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="description" content="speedy-vision.js: GPU-accelerated Computer Vision for JavaScript">
        <meta name="author" content="Alexandre Martins">
        <title>Image Portals</title>
        <link href="demo-base.css" rel="stylesheet">
        <script src="demo-base.js"></script>
        <script src="../dist/speedy-vision.js"></script>
    </head>
    <body>
        <h1>Image Portals</h1>
        <form autocomplete="off">
            <div>
                <label for="mux-port">Select your source:</label>
                <select id="mux-port">
                    <option value="0" selected>Video</option>
                    <option value="1">Portal</option>
                </select>
            </div>
        </form>
        <div>
            <span id="status"></span>
            <canvas id="canvas-demo"></canvas>
        </div>
        <video id="video"
            poster="../assets/loading.jpg"
            loop muted autoplay playsinline hidden
            title="Free video by Wendy Laplume, https://www.pexels.com/pt-br/video/passaro-ave-passarinho-concreto-4168986/">
                <source src="../assets/bird-walking.webm" type="video/webm" />
                <source src="../assets/bird-walking.mp4" type="video/mp4" />
        </video>
        <script>
window.onload = async function()
{
    /*

    This is our pipeline:

    Image  ---> Image --------> Image
    Source      Multiplexer     Sink
                ^   |
                |   |
    Image ------+   +----> Gaussian ---> Image
    Portal                 Blur          Portal

    */

    // Form elements
    const muxPort = document.getElementById('mux-port');

    // Load a video
    const video = document.getElementById('video');
    const media = await Speedy.load(video);

    // Setup the pipeline
    const pipeline = Speedy.Pipeline();
    const source = Speedy.Image.Source();
    const sink = Speedy.Image.Sink();
    const mux = Speedy.Image.Multiplexer();
    const blur = Speedy.Filter.GaussianBlur();
    const portal = Speedy.Image.Portal.Source();
    const portalSink = Speedy.Image.Portal.Sink();

    source.media = media;
    portal.source = portalSink;
    mux.port = 0;

    source.output().connectTo(mux.input('in0'));
    portal.output().connectTo(mux.input('in1'));
    mux.output().connectTo(sink.input());
    mux.output().connectTo(blur.input());
    blur.output().connectTo(portalSink.input());

    pipeline.init(source, sink, mux, blur, portal, portalSink);

    // Display the result
    (function() {
        const canvas = setupCanvas('canvas-demo', media.width, media.height, video.title);
        let image = null, frameReady = false;

        async function update()
        {
            mux.port = Number(muxPort.value);

            const result = await pipeline.run();
            image = result.image;

            frameReady = true;
            setTimeout(update, 1000 / 60);
        }
        update();

        function render()
        {
            if(frameReady) {
                renderMedia(image, canvas);
            }

            frameReady = false;
            requestAnimationFrame(render);
        }
        render();

        setInterval(renderStatus, 200);
    })();
}
        </script>
        <section id="speedy-vision">
            <span>Powered by <a href="https://github.com/alemart/speedy-vision" target="_blank">speedy-vision.js</a></span>
            <a href="https://github.com/sponsors/alemart" target="_blank" class="button">
                <img alt="GitHub Sponsors" src="https://img.shields.io/github/sponsors/alemart?style=for-the-badge&logo=github&label=Sponsor&labelColor=royalblue&color=gold">
            </a>
        </section>
    </body>
</html>